Don't think it's the same then. This is definitely async standard old 8N1 1500 baud it seems. This changer is from about 96 so maybe they changed somewhere in between. As far as I was aware though the were two changer types only MBus and AiNet.

I have found a site though here that talks about 91-92 NSXs and retro fitting an Alpine MBus changer so maybe I have something slightly screwy - but I doubt it since I can currently pull things like button presses/commands, disc, track and track time out of the data stream.

It's basically just the checksum and all the different packet types I have to sort out now.